TROJ_DROPPER.TQR
PWS:Win32/Zbot (Microsoft); PWS-Zbot (McAfee); Trojan.Zbot (Symantec); Trojan-Dropper.Win32.Injector.ajiq (Kaspersky); Trojan.Win32.Generic!BT (Sunbelt); Trojan.Generic.KD.481864 (FSecure)
Windows 2000, Windows XP, Windows Server 2003
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Trojan
Destructiveness: No
Encrypted:
In the wild: Yes
OVERVIEW
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It deletes the initially executed copy of itself.
TECHNICAL DETAILS
Arrival Details
This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This Trojan creates the following folders:
- %User Profile%\Application Data\Unwiy
- %User Profile%\Application Data\Mioz
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
Autostart Technique
This Trojan adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{ED95C869-2538-D02F-8F88-9CE204D768AA} = ""%User Profile%\Unwiy\tulefuf.exe""
Other System Modifications
This Trojan deletes the following files:
- %User Profile%\Cookies\administrator@google[2].txt
- %User Profile%\Mioz\lociwyt.tmp
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.)
It adds the following registry keys:
HKEY_CURRENT_USER\Software\Microsoft\
Hiokba
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Privacy
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Hiokba
Niow = {random values}
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager
Server ID = 4
HKEY_CURRENT_USER\Software\Microsoft\
WAB\WAB4
FirstRun = 1
HKEY_CURRENT_USER\Identities
Last Username = "Main Identity"
HKEY_CURRENT_USER\Identities
Last User ID = "{341F68BA-C841-4200-A7B4-3D5CFF202166}"
HKEY_CURRENT_USER\Identities
Identity Login = 9853
HKEY_CURRENT_USER\Identities
Identity Ordinal = 2
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
ConnectionSettingsMigrated = 1
HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\
Software\Microsoft\Outlook Express\
5.0
StoreMigratedV5 = 1
HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\
Software\Microsoft\Outlook Express\
5.0
Settings Upgraded = 7
HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\
Software\Microsoft\Outlook Express\
5.0
Running = 1
HKEY_CURRENT_USER\Software\Microsoft\
Internet Account Manager\Accounts
AssociatedID = {random values}
HKEY_CURRENT_USER\Software\Microsoft\
Hiokba
Rehaetu = {random values}
HKEY_CURRENT_USER\Software\Microsoft\
Hiokba
Poehiml = {random values}
Dropping Routine
This Trojan drops the following files:
- %User Profile%\Application Data\887721875.log
- %User Profile%\Unwiy\tulefuf.exe
- %User Profile%\Mioz\lociwyt.yhs
- %Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Sent Items.dbx
(Note: %User Profile% is the current user's profile folder, which is usually C:\Windows\Profiles\{user name} on Windows 98 and ME, C:\WINNT\Profiles\{user name} on Windows NT, and C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003.. %Application Data% is the current user's Application Data folder, which is usually C:\Windows\Profiles\{user name}\Application Data on Windows 98 and ME, C:\WINNT\Profiles\{user name}\Application Data on Windows NT, and C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000, XP, and Server 2003.)
Other Details
This Trojan connects to the following possibly malicious URL:
- http://{BLOCKED}nawards.com/wp-content/themes/twentyten/config.php
- http://www.{BLOCKED}e.com/webhp
- http://{BLOCKED}eative.com/textpattern/tx.php
- http://{BLOCKED}nawards.com/textpattern/tx.php
It deletes the initially executed copy of itself
This report is generated via an automated analysis system.
SOLUTION
Step 1
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Restart in Safe Mode
Step 3
Delete this registry key
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft
- Hiokba
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer
- Privacy
Step 4
Delete this registry value
Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.
- In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- {ED95C869-2538-D02F-8F88-9CE204D768AA}=""%User Profile%\Unwiy\tulefuf.exe""
- In HKEY_CURRENT_USER\Software\Microsoft\Hiokba
- Niow={random values}
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager
- Server ID=4
- In HKEY_CURRENT_USER\Software\Microsoft\WAB\WAB4
- FirstRun=1
- In HKEY_CURRENT_USER\Identities
- Last Username="Main Identity"
- In HKEY_CURRENT_USER\Identities
- Last User ID="{341F68BA-C841-4200-A7B4-3D5CFF202166}"
- In HKEY_CURRENT_USER\Identities
- Identity Login=9853
- In HKEY_CURRENT_USER\Identities
- Identity Ordinal=2
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- ConnectionSettingsMigrated=1
- In HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Software\Microsoft\Outlook Express\5.0
- StoreMigratedV5=1
- In HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Software\Microsoft\Outlook Express\5.0
- Settings Upgraded=7
- In HKEY_CURRENT_USER\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Software\Microsoft\Outlook Express\5.0
- Running=1
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Account Manager\Accounts
- AssociatedID={random values}
- In HKEY_CURRENT_USER\Software\Microsoft\Hiokba
- Rehaetu={random values}
- In HKEY_CURRENT_USER\Software\Microsoft\Hiokba
- Poehiml={random values}
Step 5
Search and delete these folders
- %User Profile%\Application Data\Unwiy
- %User Profile%\Application Data\Mioz
Step 6
Search and delete these files
- %User Profile%\Application Data\887721875.log
- %User Profile%\Unwiy\tulefuf.exe
- %User Profile%\Mioz\lociwyt.yhs
- %Application Data%\Identities\{341F68BA-C841-4200-A7B4-3D5CFF202166}\Microsoft\Outlook Express\Sent Items.dbx
Step 7
Restart in normal mode and scan your computer with your Trend Micro product for files detected as TROJ_DROPPER.TQR. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Step 8
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %User Profile%\Cookies\administrator@google[2].txt
- %User Profile%\Mioz\lociwyt.tmp
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